R-Sport’s 3-inch T304 stainless decat downpipes and midpipe for the S58 - built for G87 M2, G80 M3, G81 M3 Touring, G82 M4 and G83 M4. Not a cat-back. Not an axle-back. This is the critical section between turbo and rear silencer: where flow gains hit hardest.
Stage 2 essential: Required before most S58 ECU maps - especially decat, fast road or track day tunes
True G8X fitment: Direct bolt-on to OEM flanges; no spacers, no grinding, no guesswork
Decat spec only: No cats, no resonators - clean gas path from turbine outlet to midpipe exit
